Dipolar Materials in an Alternating Field

Now replace Pit) with soxEqC K where y is the complex susceptibility. 

Notice that the susceptibility contributions from the permanent dipoles vanish for 

A similar result was obtained by Debye for liquids and gases in which there is no potential barrier to inhibit the dipole motion. In this case the relaxation time results from the viscosity of the medium and is given by T = i r r]R /kT, where R is the radius of the molecule and the susceptibility is obtained from Equation 23.24 as 

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